CRYSTAL STRUCTURE OF E. COLI PURE, AN UNUSUAL MUTASE THAT CATALYZES THE CONVERSION OF N5-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (N5-CAIR) TO 4-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (CAIR) IN THE PURINE BIOSYNTHETIC PATHWAY
X-RAY DIFFRACTION
Crystallization
| Crystalization Experiments | ||||
|---|---|---|---|---|
| ID | Method | pH | Temperature | Details |
| 1 | VAPOR DIFFUSION, HANGING DROP | 8 | 291 | PEG400, TRIS.HCL, MAGNESIUM CHLORIDE, pH 8.00, VAPOR DIFFUSION, HANGING DROP, temperature 18K |
| Crystal Properties | |
|---|---|
| Matthews coefficient | Solvent content |
| 2.22 | 55 |
Crystal Data
| Unit Cell | |
|---|---|
| Length ( Å ) | Angle ( ˚ ) |
| a = 113.04 | α = 90 |
| b = 113.04 | β = 90 |
| c = 49.41 | γ = 90 |
| Symmetry | |
|---|---|
| Space Group | I 4 2 2 |
Diffraction
| Diffraction Experiment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Crystal ID | Scattering Type | Data Collection Temperature | Detector | Detector Type | Details | Collection Date | Monochromator | Protocol | |||||
| 1 | 1 | x-ray | 180 | CCD | ADSC QUANTUM 4 | 1998-01-01 | M | SINGLE WAVELENGTH | ||||||
| Radiation Source | |||||
|---|---|---|---|---|---|
| ID # | Source | Type | Wavelength List | Synchrotron Site | Beamline |
| 1 | SYNCHROTRON | CHESS BEAMLINE F1 | CHESS | F1 | |
Data Collection
| Overall | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (Observed) | R Merge I (Observed) | Net I Over Average Sigma (I) | Redundancy | Number Reflections (All) | Number Reflections (Observed) | Observed Criterion Sigma (F) | Observed Criterion Sigma (I) | B (Isotropic) From Wilson Plot | ||||||||
| 1 | 1.5 | 20 | 97.2 | 0.077 | 6.8 | 7.7 | 193682 | 25072 | 1 | 14.6 | |||||||||
| Highest Resolution Shell | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ID # | Resolution (High) | Resolution (Low) | Percent Possible (All) | Percent Possible (Observed) | R Merge I (Observed) | Mean I Over Sigma (Observed) | Redundancy | Number Unique Reflections (All) | |||||||||||
| 1 | 1.5 | 1.58 | 86.7 | 0.172 | 3.9 | ||||||||||||||
Refinement
| Statistics | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diffraction ID | Structure Solution Method | Resolution (High) | Resolution (Low) | Cut-off Sigma (I) | Cut-off Sigma (F) | Number Reflections (All) | Number Reflections (Observed) | Number Reflections (R-Free) | Percent Reflections (Observed) | R-Factor (All) | R-Work (Depositor) | R-Free (Depositor) | R-Free Selection Details | Mean Isotropic B | |||||
| X-RAY DIFFRACTION | MAD | 1.5 | 20 | 1 | 2 | 25065 | 24987 | 1252 | 99.7 | 0.189 | 0.186 | 0.213 | RANDOM | 14.2 | |||||
| Temperature Factor Modeling | ||||||
|---|---|---|---|---|---|---|
| Anisotropic B[1][1] | Anisotropic B[1][2] | Anisotropic B[1][3] | Anisotropic B[2][2] | Anisotropic B[2][3] | Anisotropic B[3][3] | |
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| x_dihedral_angle_d | 22.9 |
| x_scangle_it | 3.18 |
| x_scbond_it | 2.15 |
| x_mcangle_it | 1.95 |
| x_mcbond_it | 1.36 |
| x_angle_deg | 1.23 |
| x_improper_angle_d | 1.21 |
| x_bond_d | 0.007 |
| x_bond_d_na | |
| x_bond_d_prot | |
| Non-Hydrogen Atoms Used in Refinement | |
|---|---|
| Non-Hydrogen Atoms | Number |
| Protein Atoms | 1196 |
| Nucleic Acid Atoms | |
| Solvent Atoms | 171 |
| Heterogen Atoms | |
Software
| Software | |
|---|---|
| Software Name | Purpose |
| SHAKE | model building |
| SnB | phasing |
| X-PLOR | refinement |
| MOSFLM | data reduction |
| CCP4 | data scaling |
